On this car i repaired both rear and front wings, and the boot lid and hood. I resprayed only the front of the hood with base color and half the hood with clear coat. No one can find the clear coat edge though, and that is the impressive thing for me with 3D compounds, that you can buff paint...
A harder sponge cut like a down arrow or like a triangle formed block of cheese and then wrapped in plastic, and then wrapped in microfiber. I found a block wrapped in microfiber on amazon, it was blue. I wonder if that block is absorbant or not? here it is...
I detailed this car with 3D ACA 500 and 3Ds white wool pad, followed by 3D ACA 520 with 3Ds black spider pad. Its the original paint and it was really hard